Prosecutors argued that Kyle Alleyne, 27, fatally stabbed 19-year-old Heather Alleyne in their apartment in August 2010 because he was angry after finding out that he was not the father of her newborn baby.

Alleyne did not react as the jury announced the verdict. The family of Heather Alleyne let audible sighs of relief, the Metro West Daily News reported.

Kyle Alleyne took the stand in his own defense on Tuesday and denied killing her. He said he found her dead after coming home following a night of drinking, and realizing he would be the prime suspect, tried to flee to Mexico.

Alleyne was arrested on the U.S.-Mexico border in Texas about 10 days after the slaying.

The first-degree murder conviction carries an automatic sentence of life in prison without the possibility of parole.

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